ms. 
b. olivacea , Tuck., ms. The dark hypothallus predominat¬ 
ing. On birch, Weymouth, and on beech, N. B. 
3- S. lactea, Kbr. On holly, 1872, and witch hazel, N. B. and 
Weymouth. Rare. 
4. S. oxyspora, (Nyl,) Tuck. On poplar, Weymouth, 1869, and 
on white birch, black cherry, and oak, N. B. and Weymouth. 
55 . VERRUCARIA, Pers., Tuck. 
* Scores simple. 
1. Y. epigsea, (Pei'S.) Ach. On naked earth. Spermatia needle- 
shaped. 
2. V. lliaura, Wahl., Th. Fr. On maritime rocks, Nantasket and 
Weymouth; Penikese Island, 1873; Smith’s Neck, Dartmouth, 1886. 
3. Y. ceutliocarpa, Wahl., Nvl. On l-ock near Quincy Point 
landing, Weymouth Fore river. 
4 . Y. mucosa, Wahl., Th. Fr. On maritime rocks, Weymouth 
Fore river, 1871. Spermatia oblong, .003-4 mm - long. A plant on 
a rock a little removed from the shore, Nantasket, 1871, with a brown¬ 
ish-red, dispersed-areolate thallus, formerly distinguished by me 
as V. sanguinolenta , is perhaps only an accidental state of this, influ¬ 
enced by the absence of sufficient moisture. Spermatia .004-6 mm. 
long. 
5. Y. striatula, Wahl. On stones near tide water at “ Hockley,” 
Weymouth Fore river. 
6. Y. virens, Nyl. On rocks, 1869. 
7. Y. margacea, Wahl., Nyl. On rocks, Weymouth, 1S69, 
Quincv, 1870, and N. B.; on submerged stones, Weymouth and N. 
B.; and I have referred here a plant with a blackening crust, on sub¬ 
merged stones in Howland’s spring. 
8. Y. nigrescens, Pers. On fragments of shells near the shore, 
old pottery and bricks. 
9. V. muralis, Ach. On mortar in walls. More rarely on stones. 
**Spores bilocular. 
10. Y. consequella, Nyl., Labuan & Singapore, (1S91,) p. 43. 
“ Hardly more than a var. of V. consequens. (Nyl. in Hue, Addenda , 
n. 1858). Spores ovoid, .012-15 by .005-6 mm. Pyre ilium dimidiate. 
Paraphyses none.” On exposed stones near tide water at “ Hockley,” 
Weymouth Fore river, 1871. 
